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J. RAMSB'OTTOM STEAM BOILER. No. 250,390. Patented Dec. 6,1881.

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i i a -fiA a I -(No Model.) 3 Sheets-Sheet 3. J. RAMSBOTTOM.

STEAM BOILER. No. 250,390. Patented Dee. 6,1881.

UNITED STATES PATENT OFFICE.

JOHN RAMSBOTTOM, OF CENTRAL FALLS, RHODE ISLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 250,390, dated December6, 1881.

Application filed December 24, 1880.

To all whom it may concern Be it known that 1, JOHN BAMsBorToM, ofCentral Falls, in the county of Providence and State of Rhode Island,have invented a new and useful Improvement in Steam-Boilers; and'lhereby declare that the following is afull, clear, and exact descriptionof the same, reference being had to the accompanying drawings, formingpart of this specification.

This invention has reference to an improvement in steam-generators, andis also applicable to water-circulating boilers for hot-houses.

The invention consists in providing a central chamber in which the wateris contained, with a downward-projectin g turret, and connectingcirculating-pipes with the same.

It further consists in the construction of the central chamber, and inthe peculiar method ofconstructing the furnace, by which the boiler issuspended in the fire-box, and a circular flue is formed around theupper end, as will be more fully set forth hereinafter.

Figure 1 is a view of m y improved steam-generator, shown without thebrick-work or other fire-box. Fig. 2 is a horizontal section of thesame. Fig.3 is a vertical section,showing the steam-generator inclosedin brick-work. Fig. 4 is a horizontal section on line a; 00, Fig. 3.

In the drawings similar letters of reference indicate correspondingparts.

A represents the upper half, and B the lower half, ot'a cylindricalvessel, each ofwhich is provided with a flange, so that the two can bereadily secured together by means of bolts, as is shown in the drawings.

0 is a pendent dome extending downward over the fire.

D represents the feed-water pipe, and E the blow-off pipe, or viceversa.

F F are a series of circulating-pipes secured near the water-line, butbelow the same, at the upper part of the cylindrical vessel, and also inthe downwardly-extending chamber 0,and as this dome is of less diameterthan the larger vessel A B the circulating-pipes F F are arranged toenter the same in two or more rows, so as to enable a large number oftubes or pipes F to be entered in the central chamber.

G is the steam or hot-water outlet pipe.

The whole boiler is suspended from the plate H, which is made in two ormore parts and (No model.)

firmly secured in the masonry, as shown in Fig, 3. The boiler isprovided with the lugs h h, which rest on the plate.

To withdraw the smoke from the fire a hole is left in the plate H,andclose to this hole the flue I is closed by a partition, the smoke-exitbeing on the other side of this partition. By this arrangement theheated products of combustion are made to pass around the upper end ofthe steam-boiler, and thus add more heat to the same.

K is the ash-pit, L the grate, and M the furnace.

By making the cylindrical vessel A B in two parts the same can bereadily cast in green sand, and a good, cheap, and reliable castingsecured. a

By extending the tubes or pipes F Ffrom the centralchamber, O, outwardseveral advantages are secured.

First. In a vessel exposed to the fire the water ascends along the sidesexposed to the heat, andismostsolidinthecenter. Thecirculatingpipes aretherefore more readily supplied with solid water.

Second. The circulating-pipes F F, when secured with short connectionsclose to the sides on both ends, are liable to leak from expansion,which difficulty is overcome by the long arm extending to the centralchamber, which secures more elasticity to the tubes or pipes.

Third. A larger area of the pipes is exposed to the direct action of theheat, being placed directly over the tire, insuring a more rapidcirculation of the water. I

As the cylindrical vessel A B is made in two parts the tubes or pipes FF may be expanded into the lower part or chamber, and when the two partsare secured together the pipes may be connected at the upper part byright and left bends, as is shown in the drawings.

This steam-generator is well adapted for the heating of houses by eithersteam or hot water. It has a solid body of water, a large amount ofheating-surface, occupies a small space, and is economical inconstruction. It requires only a small quantity of coal to get up steam,as the water circulates rapidly and sends the heated water to thesurface. It is therefore economical in fuel.

- Having thus described my invention,I claim as new and desire to secureby Letters Patent- The c0n1binati0n,with the Vessel A B, provided withthe chamber 0 and the tubes or pipes F F, ofthe lugs h h and the plateH, constructed to suspend the steam-generator within the furnace, asdescribed.

2. The combination, in a steam-generator, of the circulating-tubesoutside the main cylinder, and connected near the top and bottomthereof,

to said cylinder being suspended Within the furnuce by a-plate providedwith an aperture, and arranged in such manner that the products ofcombustion passing from the main flue will pass through said apertureand circulate around its top, by which the steam in the cylinder is [5superheated, as shown and described.

JOHN RAMSBOTTOM. WVitnesses:

JOSEPH A. MILLER, J OSEPH A. MILLER, Jr.

